My sister has always been a big girl ever since she was young – call it conditioning but she also struggled with food over the course of many years so when she hit puberty she was already quite chunky and kids are so cruel about weight.

One day we were playing games in my room and talking and she started getting really down and depressed because a boy told her she was too fat to kiss and she hated herself and her body. It was really awful stuff. Being a good brother I was saying the usual things to try and get her out of this way of thinking because although she was plus size, she was also pretty and was such a lovely person, but she wouldn’t hear any of it. Throughout the course of the evening, she was still on this subject of never having kissed anyone and she’d die alone not knowing what it felt like and that I was the only boy who ever talked to her nicely, and I said jokingly that I’d kiss her if she would just shut up for a minute and let me play this level.

She went silent for a minute and then quietly said “ok, I’d be ok with that”. I mean at first I completely dismissed it, but looking at her I could tell that she really was serious, and she looked so sad that I just thought a quick kiss would be ok, so I leaned in to her and our lips met – briefly – but they were soft and warm and tasted really good so we kissed for like 5 seconds with mouths closed before we pulled back. She was smiling like mad and turned bright red and it felt so good to be able to make her feel better. So I said something like “ok so now you can tell people you’ve been kissed” and went back to playing the game.

So like fast-forward to the next afternoon and we’re playing Mario Kart together and getting quite competitive about it and I said 5 bucks on the next game and she said “ok but if I win you have to kiss me again” and blushed. So we played – I won, and she was so disappointed that I felt bad. I told her that it was a one time thing and that brothers and sisters shouldn’t practice kissing on each other. She started crying again ands saying that she must have done it wrong and she wouldn’t tell anyone and didn’t it feel good and the more she said the less I resisted until we kissed again, first just on the lips but when she opened her mouth I followed. It did feel good, the fact that she was my sister just sort of fell away at that moment. We made out until dinner, and then again in her room before bed.

From then on, making out was a regular thing for us at home and as usual with making out, our hands wandered. The first time she reached down my pants was pretty special. I resisted at first but she just whispered ‘please just let me’ over and over again. I mean my dick is very average but it was the first she’d seen, so she was fascinated by it. I told her what felt good. “Can I kiss it” she asked and I told her she could do anything at all with it. That night my sister gave me my first blowjob. She started off just with the whole thing in her mouth sucking like a lollypop, but quickly figured out what I liked. I told her that I was going to cum and she should stop but she batted my hand away.

It took about a month for us to go from first kiss to losing our virginities to each other. We waited until mom and dad were out of town for a night after I had stolen a few condoms from his and moms bedside drawers. Obviously we’d been fully naked together before then but not in mom and dads bed. We were both so nervous and checking everything was good between us. As she spread her legs I guided myself inside her and we both shivered as she took me fully. It was actually quite romantic I suppose as we made love, but because she was bigger I kept sliding out of her so I suggested she go on all fours, which was much better. I came before she did, carefully pulling out of her and cleaning up the bit of blood she had left, and we cuddled. She said she was so glad we had lost to each other, that she wanted it to happen with me and that she felt like a woman more than she ever had before, which was so sweet.

So I’m not saying I have a magic dick, but Katie changed that night – she became a bit more confident in herself around school and started to not take any shit from her bullies. Over time her grades improved and she started to work out. She lost over 70lbs over two years, got curvy rather than obese, met a decent man and had two kids. We stopped having sex when she got serious with her now husband, neither of us felt right about doing it behind his back but we still used to make out from time to time.

So that’s my confession. I’m not ashamed of it because despite the taboo, I feel that it really helped my sister get some confidence in herself.