I... I really want to see this kind of manga. Sounds like it would be a great 4-koma or just good comedy-ecchi manga (the ecchi part wouldn't even be needed to be honest).
The EndGet over-confident.Don't...to completion...!?He took foreplayIn that instant...Kou-kun...
Don't tell me...W... Wait... This sensation...!My lower body is... trembling, and I can't move...Huh?You snooze, you...Hehe~n.