Okay, I'll try to keep this as short as possible. Last year, dss (then 12) came to stay with us for a month in the summer. This is only the second time he has come for a long visit, so we are really still in the process of establishing our relationship. During his visit, we went to visit my sister and her family. Dss met my sister's step-daughter, and they have "fallen in love". Last summer they hid it from us, and it wasn't until one of their cousins discovered them kissing that we knew what was going on (although we suspected something because they always wanted to be together). Then, both of them came for Christmas visits, and they were sort of ridiculously all over each other at a family holiday party. So, we ( my dh, me, my sister and her dh) laid down the law. No being alone, no holding hands, obviously no kissing, etc... Fast forward to this summer visit. They talk on the phone daily for an hour. They celebrated their "anniversary". During our visit to my sister's house they escaped a couple of times and were found, of course, kissing. DSS is going to be 14 in September, and my step-niece just turned 15. To me, I feel like this cannot end well. They are cousins. Even if they aren't blood related, this just feels wrong, but now I feel like we handled this so badly, now they are so deeply emeshed in this relationship... it's just a mess. It really concerns me. Am I making too much of this? Thanks in advance for your feedback.
Just wanted to add that all of this is going on in front of dd who is five because she follows them around (she loves my dsniece). And both my sister and I have little ones to watch which has made it more difficult to be able to watch them every second. Just complicates things a little more, I guess.