I have recently moved in with a woman we are sleeping together, she has a 14 year old son who doesn't like me at all I can see he sees me as an intruder in his home, we haven't had any verbal disagreements, when I kiss his mother he glares at me, we always kiss with our mouths open and tongs, I noticed when he is going out he always kissed his mother on the lips not in a way a lad should kiss his mum, he holds the kiss until she pushes him away, she looks embarrassed at me, at weekends ime first in the shower when I come out of the shower he is in bed with him mum I haven't seen anything inappropriate happen between them, usually at weekend I wet shave but this day I didn't so I was out of the shower sooner, when I walked in the bedroom his mum was sat with her knees up she put them flat at once he was lay down at her side, they looked sheepish, I was suspicious so I pulled the bed clothes back saying come on you two its time for up, my girlfriends nightie was up not covering her bottom, he had his pyjamas on I could see his bulging cock and it was quite a bulge, when she got out of bed there was a wet patch and she covered the bed up.
What should I do or not do, I have watched them since and seen him touch her bottom when ime watching, I can understand her letting him fuck her after seeing the size of his cock, I have had thoughts I shouldn't have about him as my post reveals ime bisexual, again what to do