The funny thing is that Jeremy is likeable enough bro/friend character and he works well as that character. So he is fun presence on other routes specially if you want him to succeed with Ivy.And that's with the bland and sexually unimpressive Jeremy in first place too.
Feels like Marcel on the other hand only exists for the kink, it was kind of interesting for him to be into Holly but then the first scene is with him and Lena so it just became tired and boring.