https://www.patreon.com/doompie
Twilight's flying lessons have taken to a slow pace, but things quickly heat up when she gets her very first wingboner...  right in front of Rainbow Dash.  
Could the cyan pegasus be responsible for this?
[Despite what you may think based on the title this is not clop, just a one-shot attempt at romance.]

Reader - http://sharpieboss.deviantart.com/
            -https://www.youtube.com/user/Murtage33e

Story - http://www.fimfiction.net/story/191018/so-thats-what-a-wingboner-is