You have to be careful with basing the punishment on what the victim thinks in these cases. Victims are often not objective. And this lack of objectivity can go in either direction. Many victims are in denial, are unaware or have suppressed the emotional damage done by these acts. In particular, if the victim happens to also be gay and coming to terms with this, he may have confused and conflicted feelings of both humiliation AND excitement by the assault. Victims of sexual assault can also become enamored of their abusers and may not be able to clearly see it as abuse.
Look at victims of spousal abuse. They often rationalize and justify the abuser's acts. And conversely, a humiliated and angry kid who is tired of being teased may exaggerate what happened and how he feels about what happened just to get the other kid in trouble.
The bottom line is that the abuser had no idea how the kid would feel about it when he did it. The act remains the act, no matter how the victim reacts to it. Otherwise, you're saying that a rapist could jump out of an ally, drag a stranger in and violently rapes her as she struggles against him. Later, because she happens to be an abused woman already in life with low self esteem and a violent father who convinces her she deserves whatever pain she encounters in life, she decides the attack wasn't that bad after all. Suddenly, he's not a rapist?
Art has a double face, of expression and illusion.