the way Shane looks at Ilya in Tampa insp. by @immovabletype's tags:

I hope you can help me. I search a tuna melt fic in which Ilya tricks Shane into a relationship. He basically says he wants to sleep with him without condoms and if it would be okay if they stop sleeping with other people. Every chapter after that was basically Shane or Ilya who tried to manipulate the other one into a real relationship except they were to stupid/afraid to talk about it.

I read something similar to this, but I am unsure if it is your exact fic. I will put below what I have found.

Boil The Frog

What if Rozanov decided to use the idea of getting to fuck raw as a way to convince Hollander to be exclusive instead.

Strike-Slip Tectonics

the tuna meltdown doesn't happen, and Shane doesn’t realize he has a boyfriend for several months

falling into you 

Ilya makes him tuna melts and says his name and Shane doesn’t freak out and run away. Well, he does freak out, but he also stays. Or the one where Shane doesn’t realize that Ilya’s his boyfriend for a solid three months

- Deadline

CONNOR STORRIE as

Next time? Yeah, we're playing Montreal in two weeks. Yeah. But, um, where would we... Where would we what? Meet? You are homeless? No. Then we meet at your house. It's an apartment.