Kogal-chan's name wasn't even given/asked for. Also, Nagashima-san might not even be a virgin. It's pretty awkward trying to explain that you're a sex toy developer to someone else, especially when they are of a different gender.
All that being said though, Yomichi-sensei has a funny debut with amaze-balls art.
Seems like "billyuns and billyuns" of Kogal-chan's brain cells were (figuratively) obliterated in that ... er, "product test" exercise. It's likely a case of her seriously underestimating the effectiveness of those toys (in actuality, they're "SUPER-EFFECTIVE!"), thereby culminating in an "Hey Mikey, I Think She Likes It" moment, especially when she "said Hello to Nagashima's little(?) friend".
Nagashima-kun just might be used to awkward moments when he tells people what he does for a living. Perhaps someone IRL in a similar position might agree.
All-in-all, this artist's FAKKU debut is "APPROVED!"
... you don't say -_-