Dr. Grandpa, with his silver hair and wise eyes, has seen it all. But these days, his patients are different - young, eager twinks seeking more than just a physical. As they lie on the exam table, their smooth, bare bodies shiver with anticipation. The doctor, with a gentle touch, explores their lithe forms, his gaze lingering on their stiff cocks. He leans in, his warm breath sending shivers down their spines. "This might sting a bit," he whispers, before taking them into his mouth, sucking and stroking until they spill their load, grunting softly in relief.