Ballbusting as therapy for my brother

This is the first time I write a story like this, so I’m curious about your reactions :)
This is my (F) fantasy, all characters are over 18 years old.

I noticed something was wrong. We’ve been home from vacation months ago and my brother is clearly feeling down, maybe even depressed !

I couldn’t take it any longer and decided to have a talk with him. I want to know what’s wrong. Lucky for me he opened up to me. During our vacation he met a girl, Sasha. I think he secretly fell in love with her. Apparently, he let her kick his balls, I never noticed !! And to make a long story short, he misses her kicks…

My jaw fell wide open, I didn’t know what to say. What surprised me even more, was his request that followed…

He wanted me to kick him in the balls !? He begged me for it. I didn’t have to think about it a lot, I wanted to see him happy and if this does it…

I admit I was a little nervous, and couldn’t stop giggling.

“So, how do we do this ?”

“We both stand up, you measure your distance to… uhm… your target and you kick. But start gently, and with the upside of your foot please. Let’s start with 5 kicks.”

I laughed. “5 kicks ! Are you sure ?”

We both stood up, he opened his legs and I made sure I stood at the right distance.

I practiced my ‘swing’ a little and then… I hit him right on target, for the first time !

He puffed, bent over just a little and laughed a little uncomfortable. And I… I started to like this ! The whole time I had a grin from ear to ear, giggling.

But I was still afraid I’d hurt him too much. So my second kick wasn’t much harder, but equally fun ! 

I got more or less the same reaction, and he assured me I could go harder on him…

Still not sure about what he can take, I kicked a little harder. This time he bent over a little further, let’s say halfway of bending over completely. “Ooomphh…” he cupped his balls, laughing uncomfortably again.

I learned that I really like doing this and got excited about it.

4th kick, whack !

I got him to bend over completely this time, hahaha.

“One kick left !” I was all enthusiastic about it. My brother needed some time to catch his breath.

Still not the hardest kick I could give him, but with a good swing… I hit my target really good !

His legs buckled and he was almost on his knees !!! I laughed so hard ! …had a strange feeling in my tummy… and… were my nipples getting hard ?!

I tried to ignore that.

My brother sat down on his bed, recovering while I stood there giggling with my arms crossed over my chest.

“So, am I making you forget about Sasha yet ?”

“Not even close …”

Wait, what ? Yeah, Frozen Anna moment here.

“... but I think you can get close”

“What ?

“She had so many ways, and techniques, and… she was so… sexy ? Devine ! She could make me want to buy her ice cream without telling or asking me to do so.. She… I’d crawl for her !”

Yeah yeah, I got the point…

I was a little hurt though, jealous, I felt like I had competition to defeat… Getting better than 'close'

I asked if he was ok. He replied he was ok and thanked me again for doing this. Leaving his room with a jealous feeling, I said he’s welcome.

Not only do I soooo much want to do this again, I need to find ways to become better than Sasha now…