Basically, my mom used to kiss me goodnight on the lips when I was younger. When I was about 8 or so I asked her if we could kiss some more, and she obliged. Basically after that point she would full-on make out with me every night before bed, for what felt like a very long time. She would use it as a punishment, too. Like if I was “bad” or something she wouldn’t kiss me that night. This went on basically every night until I was 12, when I told her I didn’t want to do it anymore. She gave me the silent treatment and just didn’t speak to me for over a week after that. At this point, I had built up such an association between our kissing and her not being mad at me, that I asked her to start kissing me again because I couldn’t stand her not speaking to me, it made me feel insanely guilty. At that point she started again, except this time it would just be whenever, except she would do it multiple times a day. It happened just whenever she wanted it. Sometimes I would ask her to do it too. This continued until I was around 16, when I told her again I didn’t want to do it. She used the same strategy as before, where she just stopped speaking to me, except this time I just chose to be okay with that. There were a couple times she guilted me into kissing her again, usually for holidays, but for the most part it didn’t happen again. At this point I’ve long since moved out and we have basically no contact.
Edit: Yes, it was tongue kissing. We both used lots of tongue. I didn’t understand what it meant at the time besides seeing it in movies and stuff, but eventually I did start to understand what it meant, and I kept doing it anyway because it was just normal for me at that point.