Lol, Gina really waited to hear if suspicious sounds were gonna come from the bedroom.
It's just an act of kindness (for now, but with ulterior motives for the future) to let Tiana sleep beside him given there's only one bed. Everything seems wholesome for now, and I admit I'd love to see something romantic develop betwen Harris and Gina, but I won't keep my hopes up. Nothing happening between Harris and Tiana would be a betrayal of the premise, and something like that rarely ever happens, at least in the manga I read.