Anal

"C-can you put it in my ass?" Jane asked sheepishly.

The creature nodded and began to prob the tip of its cock at her entrance. She moaned as it pressed inward, slowly stretching your girlfriend's hole. Jane was moved down the the floor on her back, legs stretched and ankles gripped by the monster. The position gave you a new view of her face and penetration. You watched the purple cock slide in and out of Jane, leaving little buldges with each movement.

"O-oh fuck, baby," she moaned, but you weren't quite sure to who. She held a breast with a free hand and massaged it, pinching her nipple occasionally.

"He feels so big, John," she gasped. You couldn't help but touch yourself while she spoke to you. The position was too good to pass up, and your heart raced while you watched this monster enjoy Jane's ass.

She curled her toes as it pounded her, and your girlfriend looked back at you, hair drooping down to the floor.

"I-I still love you, John," she reminded, letting out a half-smile before being overtaken by lust once more.

"I love you too, sweetheart," you responded quietly, continuing to rub your cock through your pants.

In a new twist, Jane was eased onto her hands and legs: doggy style. The large hands of the creature wrapped around her waist, assuring its complete control over her. Your girlfriend's tits flailed as its eldritch cock pounded her ass once more, each thrust making her moans grow with intensity.

Jane felt her orgasm coming on, and this sickening creature was the cause, but it felt so good. It's cock was bigger than yours, so much so it buldged her stomach with each thrust.

"F-fuck, you're going to make me cum..." she moaned, then began to look you im the eyes.

Pickening up its pace, the creature laid into her, determined to grant her the most otherworldly orgasm she's ever had. She practically screamed as it crept on her, and it hit her hard: her eyes rolled into their sockets, legs quivered and closed, and she sank into the floor, breathing heavily.

"O-oh my god..." Jane muttered, taking deep breaths between each word.

Now that she had finished, you figured it was time that the eldritch creature had his release as well.