Mixed Feelings; Mattheo Riddle- Book 3

"These last few years, everything's been mixed. But not with you. Everything is so clear with you." Their hands interlock, and they gaze into each others eyes. "I love you."
READ BOOK 1 AND 2 BEFORE THIS!
Context(important):
Snow Potter and Harry Potter are siblings and Harry is one year older. They both have a scar and protection from their mother's love and are both famous and enemies of Voldemort. They were separated at birth to be kept more safe and harder to find from Voldemort's followers. She grew up in the USA and went to a school for witchcraft and wizardry like Hogwarts. She had a dark past there- She started school a year earlier than Harry and others because that's the system there.
Snow Potter would visit Hogwarts every single year at the end of the year to get close with her brother and make friends but also to help with conflicts ( she was there to find Sirius Black, Sorcerer's Stone, etc. Btw, she went to school in the US(witchcraft) and it was slightly more advanced there so she knows more than Harry.
Warnings: Mentions of self harm, drugs, PTSD, trauma, violence, etc.
I don't own any of the characters here except Snow Potter, Tyler, Loren, and other non canon characters other than Mattheo.