All of Me by Victoria Sue

Shae
I was broken.
Someone had broken me.
Or broken my heart.
The mark on my face should mean I was powerful. I could move faster than the eye could track. But thanks to being held against my will and viciously experimented on the resulting scarring to my heart meant I would be lucky to ever run again, even at normal speeds.
No wonder Ringo didn’t want me.

Ringo
As a Marine and specialist bodyguard, feeling helpless wasn’t something I was used to, but the day I’d carried Shae out of that laboratory, his body burned, barely breathing, had just about broken me.
Then one innocent kiss finished me off, and I ran.
I was too old, too jaded, and the last thing Shae needed.

Leaving Shae broke my heart, but coming back might just rip it in two.