Can you feel him ejaculate?

For the most part yes, I can feel a guy cum in my pussy, but it can depend on how much he cums. I don't feel it as much if he cums in my ass, however.

Yes

Most of the time. I really love the feeling but sometimes ill miss it, if he's dehydrated for example and it's a smaller load or if I'm too... distracted. Condoms and smaller dicks do have an impact but even then if he is well hydrated you can still often feel him. Drink your water boys!