In Between S2-> S3(Megatron X OC X Optimus)

Season 2:

New discoveries, new threats, new friends.
With the things that happen drive ShiverTooth back into his depression state. Hopefully Megatron or some bot can drive him out before he wants to end it all. It does for almost a split second before Megatron does something he will regret for the rest of the time he has with his precious seeker.

Season 3:

Despite Shockwave and ShiverTooth having a bond again after years of separation, ShiverTooth is learning about his autobot friends once more. With his pure spark fixed once more, he is a lot more into things and less ignorant and moody. But with great things comes great responsibility and great consequences. Since Starscream wanted his brother to be the con that he is, he will continue to try and drive him towards it. No matter what. ShiverTooth will soon choose his side, whether it be autobot or decepticon, but with that- things will change dramatically....