My wife is 5 years older than me and has a sister who is two yrs younger than me and i was 30 at the time. well one night i was driving past the sisters house when i noticed she was standing in the lounge room, she had a low cut top on and is very well breasted. I pulled up and made an excuse as to why i was there on my own, i told her i was driving past and needed some eggs that i forgot to get from the shops. as i went into the kitchen the sister bent down to get the eggs out of the cupboard and her breast came out of her shirt, she had no bra on. this was too quick i couldnt think so i said "nice" as she got up she was embarrassed, i said "its ok" ive seen breasts before", she smiled, then she turned around to get me a bag for the eggs and i had this deep impulse to grope her, as i went to touch her she stood back in shock. I compossed myself and she asked if i really knew what i was doing, i said "yes i think i do", she didnt want to upset her sister. She came closer and pulled her shirt down and told me to touch her breast, i did, it was firm and tender, different to my wife' breasts bigger too. i got greedy and reached for the other breast, she ended up topless, i turned her around and started to kiss her shoulders and cup her breasts with my hands, we started to go towards her bed room when my wife rang on the celular, asking where i was. i told her "i was caught up in the shops" the sister got dressed and i left... the next night my wife had a meeting and i offered to drop her off and pick her up, she thought it was a nice gesture. little does she know that i went back to her sisters house to finish off from the night before... Only problem is now is that when ever the sister comes around she wears a real low cut shirt and my wife thinks she is being flirtatous, where really she is showing me what i am missing out on, but i do get flashes of her breasts as sits on the chair in the lounge and when my goes out to make coffee the sister bends over in front of me and pulls her shirt down.... And i always offer to do handy man stuff around her house as well, and last time we had sex on the bench in her shed, i was doing some wood work and she came and sat on the bench and i realised she hade no under wear on under her short skirt. I didnt just hammer or screw the wood i hammered and screwed the sister as well.