Draw Alphie like one of your wolf boys! (4) (Semi R-18)

"You can fiddle and pinch your nipple with your free hand, but maintain your current posture," Cha Junshik instructed. "Keep stroking your cock." 

Alpheus nodded, "T—Thank you, Sir…."

Alpheus reached his nipple with his free hand and started by groping his chest, then he continued by fiddling and pinching the nipple. 

"Uhhhh!" Alpheus' nipple was a sensitive part of his, especially when Sir Junshik Hyung was present to watch his one-man show. 

When Sir Junshik Hyung looked at him playing with his nipple and cock, it felt like Sir Junshik Hyung was behind him the whole time, groping his body from behind and whispered—

"You're a natural-born slut, Alpheus," Cha Junshik said as he continued sketching.

"Ah! Ah! S—Sir, please don't say that!" Alpheus protested, but his hand stroked his cock faster, and his other hand rubbed his nipple harder. 

"Why can't I say that?"

"Because… um… because…."