I'm not sure if I'm understanding you correctly, but if you mean that Mike's content should be available only if Lena had fucked Robert before, then I think that's a Small Chungus unwholesome 100 idea, my dude. I was actually very happy that Lena now has an option for getting casual sex that does not require dealing with Robert The Cringelord.
Let me clarify what I mean. I like Mike's character. He's a very nice addition, and it was about time he was introduced to the cast of characters, particularly because the game lacked decent (or decent enough) male characters.
However. My criticism was not aimed specifically at Mike or what he can offer to Lena. My criticism was aimed at Lena's behavior around him in this update, or rather, very fast development between them. I'm all for having another casual relationship with no strings attached with him, but there are still obstacles in their way that are kind of a big deal for Lena who has some dignity left (no Robert). I think sex with Mike in this update should have had *some* conditions and limitations other than high Lust stat. Or it should've cost Lena a Will point. Compare it to Chapter 4, where Lena can invite Ian to end the night in her place only if her Lust is high AND Ian decided to make out with her. If Ian doesn't give her enough signals, then she's not bold enough to follow through with her desire. In this update, suddenly nothing holds her back with Mike: not the fact that he has a girlfriend and not Louise's state of misery which I'm not really comfortable with.
TL;DR: Yes to Mike, but in order for not slutty Lena to have a shot with him, there has to be some inner turmoil where she confronts all the pros and cons, and a bit of drama, not just for the sake of it, but to make their relationship work better and better showcase Lena's character change, to the point where she stops caring about whether or not she's causing problems to this guy's relationship or not. Hell, in comparison, even Ivy has standards, she didn't want to continue dealing with Jeremy once she discovered that he seriously dated another girl. What kind of power made Lena even sluttier than Ivy so fast?