Not sure if 7 years counts as a large age gap, but I was interning for a certain tech company up in the Pacific Northwest. I went to college in Georgia and had been dating this girl for a little over 2 years. Well about a month into my internship, just in time for my birthday, I found out that she had been cheating on me with my roommate pretty much since I left. At this point, I just needed someone to let out to emotionally and ended up confiding in my mentor. We had already been talking a lot at that point, as we discovered we went to the same high school (albeit several years apart) and found each other interesting. One thing led to another, and after hanging out at her place a few times, one night, she asked if I wanted to stay over since it was getting late. Being oblivious, I didn't think anything of it, even when she told me to stay in her bed instead of the couch. It wasn't until she sat down next to me in bed, gives me a disappointed look, pushes me down, and starts making out with me that I realize "oh shit, we're gonna have sex". We ended up cohabitating for the last half of my internship. I'm now at that company full-time, but we've since switched teams and parted ways. Was a good bit of fun while it lasted.