This is starting to be a bit of a trope or sub-genre in yaoi, huh...
The MC gets convinced into thinking a friend is helping them 'train' but it always ends up bullshit. There are quite a few stories with similar plots.
I wonder if there'd ever be a manga where it honestly would be training? haha
╮( ̄▽ ̄)╭
Looks like its surprise uterus time.
I've seen stuff like that before but where do the eggs come from though?
Magic. Expecto Ovum!!!