Peter takes Kate up the ass with a little help.

Bryan supported Sandy as she sagged forward off the double dildo. Kathryn was still clutching the grab bar, with half the dildo sticking out from behind her. Water from the shower ran down her legs and dripped from her breasts.

"Kate love," Bryan told his wife, "Maybe we should take this to the bed."

"More. Anything. Anywhere. Someone," Kate said, still hungry.

Peter grinned. "Anything? Anywhere? Let me step in." He picked the silver bottle of silicone lube. "How about I take over for Sandy?"

"Yes," Kate said.

Peter kissed the tip of the dildo that had just been in his wife Sandy's pussy, then gave the tip and shaft a generous coat of lube. He turned away and bent his knees, adjusting the angle, and slowly worked the end of the dildo into his ass, sighing when the shaft slid up inside.

"Fuck me, Kathryn Lang Carlson," Peter said. "Fuck me with your big cock."

Kathryn tightened her pussy and pushed the dildo back at Peter. As she worked up to a rhythm, Peter moaned with each thrust.

"So good," Peter said. "Oh, fuck me." His hands were tight on his bent knees, bracing against Kathryn's thrusts. "I love your cock in my ass, Kate."

Bryan and Sandy held each other as they watched their wife and husband together. Sandy grinned and nibbled on Bryan's ear. "Mmm, you're hard. That's right, we interrupted something," she said.

Peter's cock throbbed, swelling to a hard erection as Kathryn held onto the grab bar and kept thrusting back at him.

"Oh wow, oh wow," Peter said. "Ohhhhh."

"Oh, Peter," Kathryn said, slowing her rhythm. "Don't come yet, I want you in me."

"Okay," Peter said. "Hold up." Kathryn stopped. Peter reached a hand behind himself, holding onto the double dildo and easing forward, sliding it out of Kate's pussy.

"Oh," Kathryn sighed.

"Kate, can I have your ass?" Peter asked.

"Oh, YES," Kathryn said. "Please."

Peter slicked a coat of silicone lube over his cock and over Kathryn's butthole, pressing gently with the pad of his finger until she opened.

"Ah," Kathryn said. "That feels nice."

"There," Peter said. He laughed. "You're nice and open. You ready?"

"Ready," Kathryn said.

The shower rained gently down on Kathryn, soaking her dark brown hair and glistening on the curves of her back.

Peter pointed his long, slim cock between Kathryn's buttocks, aiming slightly high, and pressed forward. "Oh, Kate," he sighed as she took him in.

"Ahh," Kathryn said. "I've missed you."

"You too. My favorite ass," Peter said. He looked over his shoulder at Sandy. "My second favorite, that is."

Kathryn laughed. "Or your third favorite, if Gary would ever let you get on top," she said.

"You're better than Gary would be," Peter said. "Sweet, lovely ass. Feels so good."

"So good," Kathryn said as Peter began to stroke in and out.

Sandy giggled. Peter still had the dildo sticking out behind him, bouncing with each gentle thrust into Kathryn's asshole.

"Do your students know you love it up the butt, Ms. Carlson?" Peter asked.

"One," Kathryn said. "Two. Courtney Jones. Sharon Nimnovick."

"You're a naughty teacher, Ms. Carlson," Peter said. "A very good naughty teacher." He thrust slowly in and out. "Oh Kate."

Kathryn took a deep breath. "Faster, Peter."

"Ah, hang on," Peter said. "Could someone help me out, grab the dildo and do me?" he asked.

"Gotcha, pal," Bryan said.

Ever since the night on the cruise years ago, when he and Kathryn watched Peter in the middle of a sandwich, both giving and receiving, Bryan knew how much it turned Peter on. Bryan stepped up and gripped the shaft, steadying it inside Peter's ass.

"You're a champ," Peter said. "Thanks."

"What are friends for?" Bryan said. "Make it good for Kate." Bryan held the dildo steady, following Peter's movements, then started working it slowly in and out, watching Peter and Kathryn's faces.

Bolstered by Bryan's assistance, Peter made love to Kathryn's ass, following the cues of her voice and breath, the tension in her anal ring and the set of her shoulders. He shifted to fast, shallow thrusts, tugging at her tight ring with his cock head. He felt her squeezing down on his shaft.

Kathryn whimpered. "Yes, yes, yes," she said.

She took one hand off the bar and reached down toward her clit.

Sandy caught Kathryn's hand and lifted it back up.

"Let me, Kate, love," Sandy said. She reached down into Kathryn's sopping wet bush and felt for her clit.

"Oh!" Kathryn said.

Sandy said, "Your clit's so big. So hard. You really love it up your ass."

"Love YOU," Kathryn gasped.

"Come for me, lover," Sandy said, strumming Kathryn's clit as Peter kept up his quick, shallow thrusts.

"Yes!" Kathryn cried out. "Yes, Peter!" Between Sandy's fingers and Peter's artful sodomy, Kathryn caught the crest of another climax.

"Oh Kate, Kate, Kate!" Peter cried out, feeling Kathryn's ass squeeze down tight on his cock as she came. Bryan joggled the dildo in Peter's ass and it was enough, Peter was coming, thrusting deep and filling Kathryn's butt with his joyful tribute.

Bryan eased the dildo out of Peter's ass and laid it down to deal with later. Peter and Kathryn folded up into each other's arms and collapsed into a cuddle puddle under the warm spray.

Bryan winked at Sandy, carefully picked her up, and carried her cradled in his arms out of the walk-in shower.