Niina literally pressures Kurisu into spending time with him or seeing him by using Kurisu's daughter, also they're first "romantic" encounter was Niina kissing Kurisu without consent and then continuing to push sexual advances even though Kurisu was uncomfortable with it.
Niina literally pressures Kurisu into spending time with him or seeing him by using Kurisu's daughter, also they're first "romantic" encounter was Niina kissing Kurisu without consent and then continuing to push sexual advances even though Kurisu was uncomfortable with it.