A quick drawing to detail each of the Mane 6's ships. No cutie marks cause I'm lazy af
Rainbow Dash and Spitfire
Rainbow Dash, upon joining the Wonderbolts, discovered she has a thing for authority figures, and Spitfire thought she looks mighty cute in the uniform… They're overly in love with each other, but have learned to separate professional and casual relationships as they've developed.
Pinkie Pie and Skystar
The two kept in touch after the whole Storm King trouble. While Skystar was clearly crushing, Pinkie Pie was very much oblivious until she was sat down and told in no uncertain terms how the Hippogriff-campi felt. Their relationship is a nightmare for everyone else, as they are bubbly fun and loud at all times.
Rarity and Maud Pie
Rarity and Maud were one of the strangest couples, but they bonded over a love for jewels and fashion. Maud is secretly very suave and Rarity does adore this secret side.
Twilight Sparkle and Big Mac
Twilight hadn't given much thought to Big Mac, until she met Big Mac in drag. She secretly attended every available show, but isn't very subtle and was very much noticed by Big Mac. Out of drag, they got closer and ended up casually dating. Whoops they're in love now…
Fluttershy, Discord, and Tree Hugger
This herd seemingly appeared out of nowhere (it actually appeared out of a trip where Tree Hugger suggested they all connect their spirits). They are very odd but fit together, and do adore each other.
Applejack
Applejack has no time for romance! She sees no need to settle down, no matter what Granny Smith says about getting a husband.