https://fek.userecho.com/communities/1/topics/1021-manual-trigger-for-orgasm

It's a real pain in the ass to finally cum in an orifice or to cum at all, so either there should be an erection bar with you all the time and not just in the shower, or you can get gradually hard by pressing 'I' on the keyboard, and to orgasm, press 'O' for that.

I think the best option would be an erection bar with you at all times anywhere, an orgasm button right next to the bar, and the manual key option to orgasm with the keyboard.

In rack 1, you had only 1 milking machine, 1 fucking machine, 1 chastity cage, 1 of each kind of dildo, and it may be nice to have multiple copies of each. multiple milking machines, multiple dildos, several copies of most or all toys would be nice. that way, we could have the exact same thing being done to each subject, without leaving anyone out.

http://fek.userecho.com/forums/1-general-suggestions-and-ideas/topics/909-breastplay/

I already know that there are suggestions of breastplay, boob-fondling, and titjobs, but I think flat-chested individuals or sizable pecs should be included as well. There are people that are into the fun and intimacy of laying one's hand or handling an individual's chest, whether that'd be flat-chests, pecs, or tits (regardless of gender).

Growth/shrink ray

if you run inside a male or female too much their belly starts growing

also you could add a chemical that makes breast or penis bigger

Instead of a regular milkers which has the subject orgasm and collects it, there could be different variations. For example, a milker with a hole at the top. Sort of like a Fleshlight but the subject will climax onto themselves instead of it being collected.

Be able to grind your penis together with the test subject's.

Let the character's skin glisten or their fur darken in color in response to intense stimulation, maybe with a few beads of sweat rolling down their body if the interaction lasts for quite some time. The effects should stay visible arbitrarily long after the stimultion is stopped (either until sweat dries on its own or it is wiped/washed off by the player).

The option to be able to put the penis in between subjects boobs, there could be like a minimum boob size in order to be able to perform this action