Slipping Through the Fingers

«"Come here." Regulus told Edlyn, breaking a kiss with Barty. The straw-coloured hair boy's expression was unreadable, but Regulus was smiling as Edlyn took off her shoes and stepped in the sofa, next to Barty, and started to kiss Regulus's neck. She then moved to his lips, her hands stroking his bare torso, his lean arms, his sharp jaw-line. Edlyn sat up straight and looked at Barty. His lips were slightly parted, his eyes looking at the girl's features. She slowly raised her hands up to his collar and started to untie his green and silver tie.»

This fan-fiction is set in the Harry Potter Universe, when Regulus Black and Bartemius Crouch Jr attended Hogwarts, during the seventh year of the protagonists. This story mainly revolves around smut.
This is not a comforting story.

TW: threesome, choking, double penetration, suicide, hair pulling.
masturbation, cunnilingus, blow job.

If you want references for the physical appearances of the protagonists:
- Regulus Black: Thimothée Chalamet in Little Women
- Bartemius Crouch Jr: David Tennant in Dramarama
- Edlyn Carrow: Lily James in Rebecca

The romantic tropes in this story:
Regulus and Barty: friends to lovers
Regulus and Edlyn: "I find comfort in you"
Edlyn and Barty: love-hate

This is story is also available on AO3.