An SnK doujin where Eren is the one to be proactive? Why aren't there more of those? I hope to see the full doujin soon if anyone can get their hands on it (I'm hoping she doesn't do anything with that old guy).
Judging by the dialog Mikasa is working in some kind of bar, where the old guy was feeling her up and Eren sees them and gets pissed off and takes her home immediately. So fortunately it looks like nothing happened with the old guy. When they get home Eren is telling her to stop working at that shop. But she's surprisingly nonchalant about the whole thing telling him not to worry about her. Like it's no big deal to her that old man was just groping her. Wtf Mikasa? Anyway it seems that spurs Eren to get things going with Mikasa. It's appears to be their first time judging by lines like "Ah kissing feels great!" and "So Mikasa let's out this kind of sweet voice..." etc.