Can I ask for again?

Me and my boyfriend (both 18) gave each other our virginities almost a month ago, we have had 8 times in total since, (4 nights, every time once at night, once in the morning) its always really great fun (even though he hasn’t made me *** yet, but I understand that comes with practice). Anyway after the first time we do it sometimes he will finger me after which is nice but I usually fake an after a few minutes which I probably shouldn’t do as he needs to learn but I’m always scared that he’s gonna get bored/tired and lose interest (it takes me a while to ***) then we snuggle and he falls asleep, I’m always left lying there wet and wanting more and I can never fall asleep, I just lay there going crazy. I’m always not sure whether or not to ask him if we can do it again straight away, how long does it usually take before a guy can do it again after ? Do we always have to wait till the morning? Would it be unreasonable for me to ask him to **** me again? I just don’t want him to say no and for me to feel rejected, or do you think he is thinking the same thing?