Honestly it's pretty much a combination of the fact that Tenka's abilities are already so busted(only Bell and Ren basically are in her tier of brokenness) and the fact that she's already so in love with Yuuki that she more than willingly joined several of his rewards as a bonus kind of almost...
I mean to be fair...
1.) You're talking about a MC here who has no qualms about literally whoring himself out to the female prisoners, of course he's gonna take the extra step to make sure the women are pleased
2.) The keyword here is prisoners. Other than Zeina who was framed for the crime of...
She doesn't even seem like she's gonna pretend to have some shitty sob story or look the least bit remorseful. She just nonchalantly shows up to his front door and smugly suggests getting back together like she's expecting him to jump at the chance and come crawling back to her.