Sometime probably after the war but definitely before Newt begins to travel, Newt and Theseus start having sex. It starts off more as Theseus showing Newt a few things, endeared and turned on by Newt’s lack of experience, and Newt is always eager to learn and reciprocate. Then it starts to happen a little more regularly, though not within the confines of an exclusive relationship, and Theseus is always the one to take charge- which Newt is perfectly fine with.

Except then Newt fucks off to do research for his book. Which Theseus is perfectly fine with. Really.

When Newt finally returns to England, he and Theseus get together for the first time in more than a year. Theseus fully expects a similar routine to before Newt left, and is very surprised when Newt takes charge and happily shows Theseus all the wonderful, dirty little things he picked up around the world. It’s certainly not an unwelcome turn of events and they both enjoy themselves, but Theseus finds he’s just a little bit jealous that someone touched/pleasured/fucked his little brother… and it wasn’t him. Maybe a little more than a little jealous.

(really looking for something with a generally light tone and would still prefer bottom!Newt, even if he’s leading the show)