Skyler had been send out to the warfronts. Geared up and ready to do her part in fighting for the Alliance. All around her she could see nervous and stressed out soldiers. Especially after the atrocities the Horde had comitted before the ignition of the war.
Skyler had met a Sentinel, listened to her story about the family she lost in Teldrassil, a sentimental moment between two warriors. Eventually, their casual dialogue quickly devolved into flirtasious comments and the Sentinel even taking the courtesy of squeezing Skyler's ass!
They both could blow of some steam before the battle began, and thus the Sentinel took Skyler to a nearby barn when the sun was going down. It didn't take long for Skyler to presume her position beneath the Sentinel before they spend all night in eachothers passionate company.