No reward for my good behaviour?

Sei ignores the sound of the phone's ringtone. He caresses her bosoms, feeling her peaks hardening under his palms. He rubs his thumbs over her nipples, sensing her quivering under him. Wakana closes her eyes and lifts her chin as his lips crash on her neck, tracing her jaw. The phone continues to ring in the background. It's annoying her. She covers his mouth and whispers with a raspy voice, "I have to pick up that call."

He lets out a low chuckle. His eyes glint mischievously, making her heart skip a beat. He reaches for the phone. He puts it in her hand. She glances at the phone's screen. As expected, it's her elder sister. She picks up the call as she tries to get up. "Elder Sis--"

[Where are you, Wakana? Your apartment is locked. I have been calling you since yesterday. Why didn't you call back?] Her elder sister sounds angry. [Where have you been all this time?]