Serena turned her head, a bit aggrieved. Her mood was already bad, and even when she was helping him with the medicine, he still had this attitude.

Matthew saw her sulking and, after a moment of confusion, leaned on her neck, stifling a laugh.

Even more irritated, Serena asked, "What are you laughing at?"

After laughing for a while, Matthew, with his head still against her neck, unexpectedly bit her neck.

The bite was light, but Serena's whole body trembled.

"Matthew!"

Matthew ignored her and didn't stop. He lightly sucked on her neck.

Serena started to struggle, her face turning as red as a cooked shrimp.

Matthew restrained her, his...