lads, is there a fetish where you get your own pleasure from satisfying your partner, even if you don't get much action at all? 'Cause Chintarou has either that, or her boobs are really sensitive, so she is feeling it when paizuri'ing Hikaru (she masturbated once with her oppais, so that may be).
Also, this chapter was really nice, having an arc where Hikaru returns to his old school might be a good idea to go