Sin for Not Swallowing

[MangaDex]

 

[batsling]

The jokes write themselves

 

[greyhud90]

boo!
No molestation happened!
...
oh wait this isnt Nhentai or myreadingmanga

 

[cherry_cake]

??? the title

 

[Keinritt]

Sees oneshot; cries to oblivion.

 

[MA333]

Is it shounen-ai? I mean it was pretty one sided and I just read https://mangadex.org/title/58219/this-was-in-the-wallet-of-my-childhood-friend but it didn't have shoujo-ai tag...