Two stepsons (17 and 16) stay with us every saturday night. We've lived in this house literally a week today meaning they have so far spent one night here (and that weekend my two kids were at their dads house meaning it was just the two DSSs here). It went great. No problems.
Tomorrow, my kids will also be here meaning there will be 4 teenagers in the house, two with special needs (his DS2 has autism and my youngest DS has ADHD). I'm stressing slightly just thinking about it but I know we'll cope.
Then, DSS1 (17) text his father asking if his girlfriend can stay with us Saturday night too 
. My argument was no because:
He shares a room with his younger brother
We'd have to pay for her to come to the cinema with us (at a time when we're really trying to cut back on spending)
The house is already going to be full of people.
DP was not happy and said the youngest lad could sleep in the dining room. How is that even fair?? we specifically bought a 4 bedroomed house so that his kids could have their own room and nobody would be made to sleep in the dining room yet all of a sudden the one lad that needs his own space due to disability is chucked out of the room to make way for the eldest's girlfriend?? Anyway DP made it clear that he'd say no but his DS would know it was me being awkward as he knows his old man would do anything for him 
The lad then text back saying "ok, maybe not sleep over but can she come to cinema with us and then you take her home?"
She lives over 25 miles away!! so that would mean DP driving 25 miles to pick her up, back 25 miles to take her to the cinema with us, back again 25 miles to drop her back at home and then back 25 miles to get home himself??? I was diplomatic but more or less said the suggestion was a piss-take. He reluctantly text his son "no can do, sorry mate" and turned to me saying he wasn't going to keep saying no to keep me happy and at some point I'd have to accept that his son has a girlfriend that we need to encorporate into our weekends. We're struggling for money as it is and he see's his kids ONCE a week - would it really hurt the lad to be away from his girlfriend for the one night a week he's with his dad?
The lads own mother refuses to do it!! Am I being the wicked stepmother?