(Guilliman can always just invade your char's planet and go 'dibs' on em, no knowledge of 40k required)

80s college party movie.

Prison cellmates.

Farming sim.

fuck it, A/B/O.

Pacific Rim!

okay wait categorize guilliman a/b/o style

Picture-perfect all-American alpha that is 99% comfortable with his privilege and role, but either gets switcheroo-seduced by a dominating omega, or just has a taboo fantasy about being fucked and cared for.