Hey, I regret to hear such things. You should write a game about that though. And make it authentic, about the authentic experience of being idk 15 and hearing about insertion for the first time, or whatever. Don't try to write about something you don't know nothing about, don't write about being a 15 year old Chad who slays all the pussy at school. DMD is written by a russian I think, where incest is literally legal. Myself, I'm from western Europe and by the time I was 12, my biology books were very explicit, so I can't really relate. Nowadays, teenage kids have seen more porn than most 50+ people have seen in their life, and even 10 year olds get endless dick pics and explicit offers in social media. I'm not saying this is great, that's just how it is.
To me it seems more like 12-13, proper flat chested or mosquito bite chested loli, as envisioned by a guy who has no idea about how lewd 13 year olds may actually act. When we're talking about girls older than 13, flat chests are very much the exception. I heard that originally, Daughter was supposed to be a literal, flat chested loli, until the legal aspects forced a change. Her flat friends are simply a remnant of the original design. Forcing a 12 year old to sometimes be 18 is a large reason for the schizophrenic character of Daughter, but more important is that it's just shit writing because not even 12 year olds would be as stupid and clueless as Daughter is. That's why she's a retard in lechertown with the MC as the creeping Gentleman.
That's just that - talk. Girls typically try to induce arousal in guys by showing off their body, but if that body is of a nature where they would never catch a guy with it (fatties and generic uggos) they develop other strategies. Men who aren't in their 20ies anymore aren't as easy to get hard, thus even conventionally attractive women would be well advised to practice alternate strategies, Talking dirty is merely one such strategy, and talking about being a huge, cock-worshipping slut is gonna work on a lot of guys. But talk is just that, talk, talk that is meant to induce arousal, which in turn creates the same sort of narcissist arousal in the shit talking girl. As a gurl you have to get the guy hard. If that happens by him looking at your naughty bits (if you look the part) or by talking shit to him, or debasing yourself etc, for the girl it's important that she can get a guy hard for her. Not being able to get a guy hard can be quite a problem for a girl, one of core reproductive and thus evolutionary relevance, you see.
For a guy, it's much less important to get a girl aroused - if you stick it in, she'll get wet soon enough. For a girl, in comparison, not just her reproductive success but her literal life may depend on getting a guy hard, evolutionarily speaking. For guys it's more important that the girl is in a general state of arousal to begin with - hormonally fertile - and displays this fertility by e.g. debasing herself. This is interestingly a "social cue" that can get both men and women equally horny.