Tsundere Onii-chan Breast Massage

*imouto means "little sister" in Japanese. Pronounced ee-moh-toh*

Wow, imouto...your breasts have gotten so big over the last year. I'm actually quite impressed. You went from a B cup all the way to an H...looks like the hormones I slipped into your tea all this time have paid off. Oh, you didn't notice it tasting funny at all? Even better. Didn't you wonder why you were getting so big? (chuckle) You mentioned you wished you were bigger. I was just looking out for you. You're not mad, are you? Come on, be grateful. I did a really nice thing, here.

Know what else helps with breast development? A massage.
Don't worry. It's not like I'm doing it because I'm into you or anything. I'm not a pervert.
Come sit here in my lap and lean back into me. Just close your eyes and relax. Feel my hands on your shoulders, running down your arms. I'm going to start the massage now, okay?
(gradually get breathier as you get more and more turned on)
Don't get the wrong idea. I'm not interested in you, even with your huge breasts now.
I did this solely out of brotherly love. I don't enjoy touching my kid sister's tits, and flicking her nipples and feeling her squirm beneath me.
...Hey.
This would be a lot easier if you wouldn't slouch. If you're going to do that, at least lie down so I can massage you properly. I'm not about to give you a half-hearted massage.
Don't worry about me being on top of you. This is only to make this easier on me. It's not like I want to do this like a man would to his girlfriend. That'd be gross. I'm not into incest.

Don't worry about me. I'm just giving you a massage. It's like a back massage just...you know, not on your back. Like I said before, I'm not a pervert, so you don't have to be on guard about whether or not I'll get a boner. You hold absolutely no sex appeal to me. I'm just doing this as a favor to you. I care about you, but I'm not sexually attracted to you, got it? I'd never once think about fucking you.