So, a certain hentai publisher now owns or has majority ownership of a hospital as part of it diversification strategy ... fine.
Protag-kun got away by the skin of his teeth by saying Tachibana-san had a fat ass when she interrupted his "relief time" ... but in the end, she seemed okay with giving him a hand ... and more.
That ending. Yes...I can definitely understand his feelings of not wanting to leave.
If your hospital stay is so pleasant and awesome, probably more so than even your normal life, why would you ever want to leave?
I suppose one option is to just ask her out when you get discharged, or just get injured again to stay there.