Background: I’m a 31 year old man, my long term girlfriend (3 years) shes 24. Her brother is 28 and is married to his 25 baby momma. My Gf and my sister in law were best friends since forever.
I’ve done a pretty good job so far of not cheating on my gf, (covid made it easier), we’ve only hung out with my gf’s family from time to time.
2 days ago was my birthday, my gf’s brothers texts her, saying they have a surprise for us. turns out it was a 420 party, and her wife made a cake.
context of my relationship with my sister in law: we always hang out with the family, shes young and fun. I’m in love with my gf, but its clearly obvious that my sister in law is hotter. She has bigger boobs, smaller waist and bigger ass. I’ve been very respectful to her and always behave, it gets particularly difficult when she usese deep cleavege. She really dresses up for small events since she never leaves the house. Ive noticed that during photos she has no problems rubbing her tits against my arm.