Ruka said she'd be more pleasant to hug when she's chubby, means that Ruka "hugs" Ritsu on daily basis.
Ritsu awoken her lesbanon chakra at the gayheadpat incident which ultimately leads her to accept her build for Ruka's BBW fetish.
I would go full conspiracy theorist to prove that these bitches, are undeniably, unironically, systematically, gay.