So this started about a month ago at my friends house when he was having a few people over to drink (I live in Alberta, Canada so the drinking age is 18). His younger sister was there but she wasn't hanging out with the group of us. I went upstairs to grab another drink and she asked me to come upstairs to her room so she could show me something. Showing me something turned into us making out on her bed for 10 minutes before we stopped and I headed back downstairs. 

Ever since that day we have been texting back and forth nonstop and I have found out a lot about this girl that I never knew before. We share the same interests and really get along. We have hung out a few times after that night at my house, but I feel bad sneaking her away. She asked me yesterday if we could move to the next step which is sex. I really want to and obviously she does as well, but I forget that her brother is one of my good friends. 

I have talked to my other guy friends about this and they all say different things. Some say do it and keep it a secret. The others say I should tell him and let him decide if he wants me to keep liking his sister. My parents leave next weekend and she wants to do it then, but I'm sick of lying to my friend and hiding things from him. What do I do?
user
My best friend's sister wants to sleep with me and I want her to, but I am tired of
assistant
So this started about a month ago at my friends house when he was having a few people over to drink (I live in Alberta, Canada so the drinking age is 18). His younger sister was there but she wasn't hanging out with the group of us. I went upstairs to grab another drink and she asked me to come upstairs to her room so she could show me something. Showing me something turned into us making out on her bed for 10 minutes before we stopped and I headed back downstairs. 

Ever since that day we have been texting back and forth nonstop and I have found out a lot about this girl that I never knew before. We share the same interests and really get along. We have hung out a few times after that night at my house, but I feel bad sneaking her away. She asked me yesterday if we could move to the next step which is sex. I really want to and obviously she does as well, but I forget that her brother is one of my good friends. 

I have talked to my other guy friends about this and they all say different things. Some say do it and keep it a secret. The others say I should tell him and let him decide if he wants me to keep liking his sister. My parents leave next weekend and she wants to do it then, but I'm sick of lying to my friend and hiding things from him. What do I do?
user
I'm having sex with my friend's sister and I don't know if I should tell him or not.
assistant