We have 3 6 and under and I mm pg and tired.
Hes a fantastic dad and devotes all his time to them. He constantly talks, plays, reads and makes things with them. Its like I have 3 sons really 
BUT when it comes to bedtime I want him to just put them to bed.
When I've done it in the past I taken them up, washed, dressed into bed, sotory, kisses - 15 mins max.
He takes them up 30 mins before their bed time, plays lego or whatever, builds a racing tracjk, they usually end up staying up playing past 7, then he reads them several stories and gets in bed with DS2 for nightime cuddles (10 minutes of ... timed by DS's bedtime musiv bear) but he almost ALWAYS falls asleep with DS and like tonight its 9pm hes been up there for 2 hours now and we will have hardly anytime together before my knackered pregnant body will have to drag itself to bed.
I appreciate hes a fab dad but considering he spends so much time with them anyways i don't think its unreasonable to say to them bedtime is story and bed.
Or should I just be grateful he does it and just lump the fact we never get any time alone??