Fandom: X-Men: First Class
Request Used: Beast (pre-transformation)/Sean/Alex, threesome relationship or sex
Characters/Pairings: Sean Cassidy/Alex Summers, Hank McCoy/Alex Summers
Summary: Sean embraces the atmosphere of openness at Charles' house, but not everyone there feels the same.
Notes: Written for zephyrprince for the 2011 xmmficathon. Thank you to lilacsigil for the beta.
Apart from Charles and Erik, Hank was the oldest of them and the best educated, but Sean would put good money on him being the most innocent.