Linda reached down to her purse and lifted out a pair of nipple clips. Looking at Viv she said it would serve her right to have to wear them all afternoon. Pulling up her sweater, Linda leaned over and lightly started biting Viv's nipples until they both stood out an inch from the rest of her breasts. Then just as Viv was starting to moan with the pleasure of it Linda and I each took a clip and placed them on her nipples. The gasp was audible and the tears in Viv's eyes were real but she said nothing until the sweater was dropped back in place and the rough inner fabric brushed her breasts. I could see her knees begin to buckle at the unexpected friction and stimulation of her breasts.