I'm so sorry, but this was me reading:

"Severus Snape was laying on top of him"
Okay...? Kinky
"[Snape's] state of nudity"
Okay...? Kinkier
"Snape was lapping up his blood"
Okay...? Up another level

Anyway. It's not quite clear to me what happens at the end: is Harry now dead? By canon logic he should be...

This is literally the best fanfic I've read yet

THIS IS THE FIRST TIME IVE READ A FANFIC LIKE THIS AND IM SCREAMING I LOVE IT SO MUCH THANK YOU FOR WRITING THIS