My Sister-in-law has always had a hot body. Maybe 5-8, nice full breasts. I never thought much about her since she never wore makeup and was a bit odd and I rarely see them even at family functions. The last few years as my mother-in-law lost her husband and as she's gotten older, I've seen the SIL more.

She had put on some weight and carried it fairly well but she always wore bulky sweatshirts and heavy clothing probably to conceal her weight gain, so you could tell she had some nice breasts but you could never see.

One Christmas we were all together, she had on her usual bulky clothing and the topic of the day was jokes about the size of her boobs. Apparently a lot of men had started noticing and surprisingly making comments to her about them. Clearly she liked it and was proudly saying how a man told her he "admired her chest". We all laughed it off, but I couldnt help but start checking them out to see if they were true.

While she was reaching up to put some plates in a cupboard and she had her arms over her head it was clear that her boobs had grown significantly from the last time I got a good look.

Fast forward to the next Summer. It was a hot day and we were helping my MIL move a bunch of her husbands stuff out of storage. It was in the upper 90s and very humid so we were all wearing as little as possible. My SIL was wearing a basic white tshirt but it was clear her boobs had exploded in growth since I had gotten a good look at them in the past. Her tshirt was straining against them and you could clearly see the outline of her big bra.

We were almost done and just the two of us were out there while she was helping me load something. She started to hand me a tool while I wasnt looking and when I reached for it I got a solid back hand push into her huge boob. She didnt say anything and we went on as normal, but it caught my attention. It felt large, firm and soft in my hand, that kind of heavyness of a huge boob.

We finished the rest of the move and when they were getting ready to leave and we were giving hugs goodby, I semi purposely didnt move my hand fully out of the way of where I knew her chest would be when she moved up to hug me and grazed my hand fully into her large tit. We hugged and she just smiled and left.

I thought that it was the end of my fun until the next Christmas. We were standing together for a group photo, she is fairly tall and I am the tallest, so she typically on the same photo row, but this time I noticed she scrambled up next to me. While we were standing in the back row I could feel her press her full breast against my arm and leave it there until the picture was taken, then she pulled it away. Since it was automatic and she had the clicker she could control when it was taken. We did another and I could feel her again press that huge tit up against me. I know theres no way she couldnt have felt it as I did.

The next time I saw her they came up to my house for a visit, which was extremely rare and a one time thing probably. They all went shopping leaving me at my house by myself, so I thought, ok Ive got to see how big those babies are. So I snuck into our guest room and found one of her bra's, a 38FF. Wow, I've never seen another woman in real life with boobs as big as hers.

I havent seen her since but I hoping we do some more family pics soon. I havent had the nerve (or chance) to try to take things any farther, but my BIL has admitted to me that shes a bit of a freak and implied they are swingers.
Hmmmmmm...