Reborn had gone to to namimori japan to train vongola decimo and when he arrived he not only found out that the one he is supposed to train does not have sky flames but his brother who does has a week body. It did not take him long to find out that tsuna not only had a weak body but is dieing and he is dieing of oh you know just a disease where he needs to find his soul mate or his flames will kill him. The thing is though the people who have this disease one day wake up with a tattoo and their soul mate wakes up with the matching tattoo it is said to be a mutation of the skull disease. Not only does tsuna have a tattoo, his is of a Black sun with a Flame that is orange behind it and reborn has seen the same tattoo... On himself.

So he is pissed like majorly pissed the only reason he does not have the disease is because his sun flames are too strong and as rapidly as the disease kills cells his sun flames create new ones so it is like he doesn't even have the damn disease. To make matters even worse he is not only attracted to the kid he actually likes the kid as he doesn't seem to get on his nerves as everyone else seems to. So to sum it up we have on really pissed of hitman who has to have sex with a teen who is his supposed soul mate because other wise the teen will die and the vongola will have no heir... GREAT JUST GREAT!