FUCKING LIGHTSABERS!!!!!
Main has a huge dick so girls get scared and run so he's never had sex. One day he finds a flyer that says there's a sex doctor /therapist who can help. He goes and finds the doc clean cum out of his ass right in front of him. After telling the doc his dick is too big the doc is immediately in love and needs to see it after measuring it he can't help but give him a bj. Later doc gives him a treatment plan to overcome his sex problems. And as "practice" doc let's main finger him like he told him to. Things get hot and heavy. Later they have sex and doc is so in love with main dick now he can't have sex with anyone else cuz and can't get hard anymore unless it's main.
Minor conflict but super cute and nice ending.
Kimi wa Kokan no Mochigusare