Yeah, that wasn't difficult to foresee. The doctor must have started planning this the moment she heard Takemura used to have sex with Mitsuki. It must have encouraged her in the "if Mitsuki could do it, I can do it as well" kind of way.
Btw, where is Mitsuki's boyfriend? We haven't seen him since he took Mitsuki+Ryuuji away from Takemura.