Entitled and Aroused

 It's super hard to get his route so lemme whip up a thing for all ya'll. You kinda have to make a lot of specific choices so don't deviate too much friends. 

(DAY 1) 
- Pick the nice option for Abel.
- Pick the nice option for Encke.
- Flirt with Selene
- Flirt with Selene AGAIN
- Talk to Deimos
- Ignore Phobos
- Screw Cain, talk to Abel. 
- "Things're going great, thank you!" 

(ON THE MISSION) 
- "Yeah, we should probably hurry up, y'know." 
- Don't go in there. 
- "Shit, is Abel okay?!" 
- "Selene, help me pick up Abel!" 

(DAY 2) 
- Wear civvies
- Ask the MO if it's okay to visit people. 
- "Yeah? What did you need?" 
- Cargo Hold
- Observation Deck 
- Med Bay 
- Bridge, Check on Selene
- What's he staring at? 
- I wonder what these guys are doing? 
- "Abel's pretty great." 
- Hangar
- Med Bay
- Bridge
- (Get me Out of Here!) 
- Mess Deck, listen in on Encke and Keeler 
- Bunk, call it a day 

(DAY 3) 
- "Uh... Yeah, might have been nice if your fighter hadn't run me off." 
- "I'd love to spend more time with you, Abel!" 
- "I think I understand what you're getting at, sir." 
- "This seems a little underhanded..." 
- "Oh, is that what the fuss over there is about?" 
- "Mind if I tag along?" 
- "Ugh, this shit again!" 
- "Kay, see you later." 
- Take a break 
- "I didn't mean to intrude." 
- Follow Deimos

HELL YEAH YOU'RE IN THE DEIMOS ROUTE CONGRATS FRIENDS. GO FIGHT FUCK WIN
Feel free to explore the route as you see fit. Most options either kill you or advance the route so you're cool. The save function is your friend.
To get the Cain/Deimos/Helios threesome, just pick the option at the end that says "Isn't Cain up there?" and to just fuck Deimos alone you pick the other option. Simple as that! 
Listen to the pretty Deimos music it's cool. 
If you've fucked everybody at this point you unlock a secret ending at the end! Congratulations! Well done.