This is you.
This is your wolf
This is your other form
your sacred gear looks like Issei's but instead it's blue, is covered in blue gems, and has a wolf head in the center.
Back story: your mom a devil your dad fought in the great war and kept you safe sadly he died while doing so. Your mom is still alive. You know she is a devil and you don't care. Issei is the only one who knows about your dark past and you live with him. Your mom works for sirzechs and rias knows you are a wolf emperor. She is just waiting for the right time to recruit you.