The boy lies on his stomach, clutching the bedsheets as he braces himself. The needle glints under the harsh light, reflecting his nervous excitement. He guides it towards his smooth, firm buttock, feeling the tip press against his skin. With a sharp intake of breath, he pushes the needle in, feeling the slight pinch as it breaches his flesh. He closes his eyes, focusing on the strange, intense sensation as the penicillin fills him, his body tensing and relaxing in rhythm with the slow injection.