It's been very different with Pip than it was with my previous dogs, but I think some of that has to do with Lurcherboy still grieving for Oldgirl and being used to living with 2, then 1, old ladies as opposed to a crazy pup.
The most I've ever had at one time is 3.
First time we had two was when we introduced our first Lurcher to our rescue GSD. GSD had spent every moment since we rescued her with either myself or dh (then bf) but took us taking in a frankly bonkers 16 week old Lurcher pup in her stride. She took on the role of matron and taught the pup good manners and how to live in house.
When the GSD passed away we took on our rescue GSD x Boxer boy. We got him at 8 weeks and he was as big as our Lurcher girl by about 12 weeks. Lurcher girl was lovely with him and it gave her a new lease of life having him around (she wasn't old, but she was grieving for GSD).
Sadly Lurcher girl got hit by a car after escaping my Mum's garden while she was dogsitting, so GSD x Boxer boy was on his own for about 10 months and coped admirably with it. (Bear in mind he was the boy that had severe fear aggression towards other dogs and new people.)
We were on a waiting list to get a Soft Coated Wheaten puppy and had to wait almost a year, as we wanted ours to be undocked.
Our hearts were in our mouths when we brought her home. We set up an indoor run in our sitting room and introduced them through the bars, with GSD x on the lead. He was fascinated at the tiny bundle of fluff and she adored him from the second she clapped eyes on him. We kept them apart, other than short introductions through the run bars for the first 48 hours. Then started having her in our arms and him loose, so he could approach and retreat as he felt he needed to. We needn't have worried. He was absolutely in love with her from the getgo and to our surprise started throwing playbows and paw swiping her. We spent a couple of hours with dh, myself and our best friend (who adores dogs but can't have one himself and was GSD x's best buddy in the whole world) lying on the floor with the two of them, rewarding GSD x boy and encouraging gentle play. From then on they were inseparable. He would let her lie on his back and bite his ears and jowls and hang onto the end of his tail as he dragged her the length of the living room! 
A year after we got our SCWT girl, we took on Oldgirl (Belgian Shepherd x Border Collie). She had an extremely bad start and was a mess with severe ear infections in both ears, a skin condition and a broken tail. By this time we had a through lounge with a BabyDan room divider across the dining room. We kept her on the living room side for two days and let GSD x boy have the freedom to approach and retreat as he felt the need, but again we needn't have worried. They said a few hellos through the bars and both kept inviting each other to play, so we opened the gate and they had a ball. Oldgirl as a 6 week old tiny bundle of fluff and teeth - with attitude. She used to literally hang off his jowls with her needle sharp teeth, while he walked around the room and would charge the length of the room, leap on his head and chew his ears - and he loved it.
Those two were inseparable and when we lost GSD x boy to fibrosarcoma at just 7 years old Oldgirl went into a deep depression. 
She became very withdrawn, didn't want to play and developed lots of anxiety driven behaviours that we worked through with her.
Ultimately the only thing that snapped her out of it was taking on Lurcherboy a year-ish later - and she and he were inseperable from day one - hence him also grieving badly when we lost her last year.
When we got Pip Lurcherboy refused to even acknowledge him for the first couple of days. It was as if was saying 'What puppy? I can't see a puppy.' and concentrating on deliberately ignoring him. He was clearly disgusted with us for bringing home a small, furry, upstart and did a lot of grumpy grumbling (not at Pip, just flopping in his bed with a grouch mutter ). I think it was about day three before he decided to investigate the new addition, but every time he tried to play with him, Pip got all worried, screamed and hid. 
Pip would approach him for comfort and Lurcherboy would tolerate him getting in the bed with him, but clearly wasn't all that chuffed about it.
Since then it's been a gradual development of their friendship. The biggest leap was when Lurcherboy realised Pip was finally big enough to chase around outside with and when they were finally allowed off-lead together on walks. It was as if the penny suddenly dropped that having Pip around might have some fun benefits. They have an absolute blast chasing each other and I think that's been the biggest success where bonding is concerned.
So, definitely not love at first sight for these two, but I feel they have been slowly, but steadily forging a strong friendship.
With Pip we tried to keep everything as normal as possible for Lurcherboy, so crated Pip in the Living room for the first month or so, so that Lurcherboy could still have his space and somewhere to retreat to when he'd had enough (his main bed is in the kitchen and we have a gate on the door which he can jump but Pip can't).
Almost forgot. With our first Lurchergirl, we introduced her and our GSD girl in my Mum's garden (which was neutral territory) and that's the recommended process. Either introduce for the first time on neutral territory or go for a parallel lead walk. We had to do things a little differently with our GSD x boy because of his fear aggression though, so his introductions needed to be done via a barrier of some sort - just in case.