Monster

Knot-like swellings at the base of tentacles lock inside the character as viscous fluids flood their uterus or colon. The explicit focus on impregnation/insemination drives both shame and arousal.

Glowing fluids excreted by tentacles create burning hypersensitivity in every area they touch. The more the character struggles, the more their nerve endings ignite with needy desperation for stimulation.

Ovipositor-tipped tentacles deposit clusters of rubbery eggs deep inside the character's body. The stretch of each egg passing through their cervix/anal ring combines with the horror of feeling them stir within. Optional fertilization themes where eggs grow larger post-insertion.

Pulsing vacuum cups latch onto nipples or cockheads, rhythmically pulling out fluids while the character struggles. The humiliation of public lactation or spontaneous ejaculation drives the scene.

Tentacles wrap tightly around the character's limbs and torso, completely immobilizing them while other tendrils explore their body. The restraint creates both vulnerability and anticipation as erogenous zones are deliberately stimulated.

The character becomes a writhing mess as clusters of tendrils pinch nipples, vibrate against their clit/glans, and pump their ass in alternating patterns. The sheer quantity of sensations pushes them toward repeated forced orgasms.

What starts as a manageable intrusion becomes an overwhelming stretch as tentacles inflate inside the character. The burning pain of expansion slowly transforms into desperate pleasure as their body adapts.

One thick tendril buries itself deep in the character's pussy/ass while another pushes into their mouth, throat, or second anal opening. The dual stretch creates overwhelming fullness and synchronizing thrusting rhythms.

Glowing pollen from the tentacles' surface overrides the character's free will. They actively spread their legs and beg for penetration, their mind fogged with artificial lust that feels irresistibly real.

A robotic rack contorts characters into compromising positions while fuck machines align with their exposed openings. The frame responds to struggle by increasing tension or vibration in sensitive areas. Stories highlight the humiliation of being displayed and penetrated by indifferent machinery, with focus on immobility and relentless stimulation.