Another scanlation says:
Ryuzaki: "I bet you can't even remember how many of my men you've sucked off anymore."
Yashiro: "All but five, Ryuuzaki."
I hope that helped.
Thank You @AnonymousOne! The translation you posted cleared it all! Thanks!
me thinks it is a mocking answer in return to the taunting. like saying "you're the biggest slut ever", and getting answered back, "i thought you knew, everybody else does" -being Yashiro and all LOL
What does Yashiro mean by answering Ryuuzaki's taunting question with (see link) "only five are left here now"?
http://www.mangago.me/read-manga/saezuru_tori_wa_habatakanai/mf/v01/c003/12/
Thank You in advance for your help.