He gets underneath her and suckles her nipples

Her orgasm is eminent. He removes his hand reluctantly, wishing he could just bring her the pleasure she desires. She remains on her knees, kneeling against the back of the couch. He slides his body between her legs, bringing his head up to her breasts. He pulls her bodice down slowly, letting her breasts fall forward out of her dress. She sighs as he exposes her breasts, eager for his touch on her nipples. He shimmies her dress down further, her large breasts hanging freely from her chest. She sit down on his thighs, her breasts hovering inches from his lips. He runs his hands over her ribs, slowly massasing the sides of her breasts. He takes her left nipple into his mouth, the whole thing, areola and all, and runs his tongue in circles. She signs again. He switches breast to breast, transitioning from licking to suckling gently. Eventually he's feeding from her breast, sucking her nipples deep into his throat, sucking the very core of her breast. She doesn't know how he can breathe, his face is so engulfed in her breast. He suckles equally from both of her breasts until they are almost sore from his attentions.