Alternatively, here is the Tentabutt option with just the anal sex.
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You sheepishly find some rocks to hide in, where you remove your clothes.
You eagerly reveal your flora pecker as it squirms and wriggles on its own, gently caressing the green surface here and there, its coloration changing as you tease yourself. After toying with your tentacle dick for a while, you decide to get do get down to business; using your newly acquired shaft muscles, you expertly guide your ever-writhing smooth shaft to your back, pointing it toward your buttocks. You grind the tip against your perky, muscular bottom, making pre-cum flow from your mushroom-like head and smearing it against your skin. Using your own seminal fluid as a natural lube, you press the tip of your pierced, wriggling plant-shaft in front of your own backdoor, stretching your anal opening little by little, careful not to tear your own insides. This goes on for a while, until you suddenly lose all patience and roughly stuff your own undulating tentacle-dick at full force inside your colon.
The impetuousness of the act makes you cry in pleasure and pain mixed, your butthole being overloaded with intense sensations. Fortunately the tender and rubbery texture of your sinuous tentacle-cock allows for more sensitivity, the subtle friction sending tingles from your crotch all the way up your spine. You shiver from the sheer cocktail of raw pleasure you're inflicting on your own body. Your meaty, wriggling plant-shaft keeps squirming against your insides, making you quiver and giggle like a whore, until it lodges all the way inside your colon, adopting a more comfortable position. You then proceed to ferociously fuck your own moist anus, stretching it a bit more at every thrust.
The conjugated friction of your undulating tentacle-dick writhing inside your devastated interior (as well as the rough hanjdob you're giving yourself) eventually proves too much for your horny body, and each of your cocks releases a massive load, squirting sexual juices everywhere inside (and outside) your body. Pressure builds in your ass (and your hands) as cum flows out of you, making each of your pricks bulge. The extra feeling sends you over the edge and you quickly reach your climax as you cum and cum. Your belly swells a bit from all the semen being packed inside you. Your poor insides cannot handle the enormous cumshot being unloaded in your moist tight butthole and a significant volume of spunk dribbles outside, carelessly polluting the floor. You groan and lazily remove your undulating tentacle-dick from your anus as you give in to your pleasure-induced drowsiness. You groan and drift into a brief catnap, your rigid erections pulsing and throbbing with continual lust.