Wife's Niece

So last night we go over to my sister in law place to celebrate her daughters graduation. dinner was around 7 and probably around 20 people there mostly family but her boyfriend and his buddy were there too. Everyone is drinking and laughing having a good time and after food desert and some more drinks its around 10:30 which now we are going to do some presents. While they are looking for the daughter i go to the car to grab a couple g*fts and while getting those g*fts something catches my eye and its a basement light turning on so i look up and through the car window i see the daughter in her bedroom taking her top off with her tits out and im like holy fuck and turned away for a second not knowing what to do but i couldn't help it and i looked back again. Now again im looking through a car window so i don't think anyone can see me. i looked for a little longer and was about to leave and just then her boyfriend and his buddy walk in the room and im like OH MY GOD is this really happening right now the 2 guys guys drop there pants and she gets on her knees and starts sucking these 2 cocks and i am completely blow away.... just in shock that this is happening right now...before presents, sucking one cock while she jerks the other going back and forth. it didn't take long for her to finish off the guys but when they did finish she just sat back and let the guys blow there loads on her face. i couldn't believe what i was seeing my wife's niece sucking 2 cocks and taking cum loads on her face. After all that i grab the g*fts go back to the party my wife ask's what took so long and i just said sorry i was on the phone. Doesn't the niece come back to the party and different clothes with her face all red, my wife ask's whats up with your face looks a little blush and the niece response was oh yeah i was just washing my face getting my makeup off and as i look over at the 2 guys they are drinking there beers and giggling. From all the g*fts she got im sure the best part of the night for her were the 2 facials for sure and now i know she a little slut, and don't get me wrong people do what they do and like what they like i was blown away by this but i understand if she likes the cock and facials