I don't know. They might be there, but latent. As far as I know, Sanada's never been on a date, so it's entirely possible. I don't think Chitose-kun would be committed in any relationship, so there's potential. As for Tezuka, if he was stupid enough to cheat on you, then I'd extend the same threat to him that I did to Oshitari-kun.

They don't seem to care about your semi-permanent staycation in my cabin.