Not sure if this is normal or not but....
it all started when we were on vacation in 2010, she would just out of the blue say things like "don't mind me" or "hey i'm going to get naked in front of you, i'm sorry" obviously not naked but she would be wearing her panties... I'll say "oh thats ok i don't care".
She never use to be like that. She would always hide or be discrete like any normal girl. she has gone as far as wear short shorts, tank top thats etc thats what normal girls do when they walk around or bum around. she's only 18 so she dress flirty. hell i couldn't even see her in a towel!
she just came to my house from college to visit her sister (my gf) and as normal i said "hey whats up" and we were just hanging out. at night though, she was in her room and my gf told me to get her a blanket. i get up from my bed and try to find her a blanket. i passed her room and her shorts are down to her knees and she's sitting on the bed. and she looks at me and i ask her "heyy.... do you mind a quilt?" and she said umm that's fine. i go get her a quilt and i return like in 5-7 seconds later. when i return, she's still in the same position sitting down with her shorts down to her knees and she's wearing sexy panties! then i can't help but look she gets up and puts her shorts back on. i went to my room and i couldn't stop thinking about her...
i woke up the next morning and i walk into my bathroom with my boxers which i had to pass her room and i know she saw me. I returned all cleaned up and i run to her room and jump on her bed. she has her legs kinda spread open because she had to make room for her laptop. i started chit chatting etc. then my gf comes in the room and starts talking to us. then her sister gets up and reaches for her jeans. i thought maybe she was going to the bathroom (like normal people would) and change..noooo instead she takes her shorts off in front of me and my gf. i was like holy<removed> she has a nice ass. i tried very hard to keep focus but i noticed she would look at the corner of her eye to see if i was looking. she had her shorts off for at least 3 mins. then she puts her jeans back on. i thought she was soooo hot.
my gf pulled me to the side and said "i saw you looking at her ass". i said "no i glanced at it but nothing more". shes like "i'm kinda mad at my sister because she was in her panties for a long time. i was about say put some <removed> clothes on". i said "don't you think it's weird that she changes in front of me?" we discussed it for a good while and basically couldn't come up with any legit answer other than maybe she's comfortable around me. she also said "i know you don't like my sister but i didn't like it when you looked at her ass".
her sister doesn't give me vibes like she's interested conversationally. she's actually pretty quiet. but she does speak her mind when given the chance to talk. but i'm starting to have a huge crush on her and i don't like it. i love my gf but damn her sister is sexy.
Is this normal? am i just taking it to the extreme?