The first time it happened, Wendy wasn't even consciously aware of it. She was a dragon slayer. Dragonslayers don't have personal space with people they're comfortable with. Natsu was a prime example of that.
Wendy only realized what she was doing when Chelia abruptly stiffened when she put her head into the taller girl's crook of the neck. That definitely shook off any lingering lethargy that had been garnered from laying about in the sun.
Wendy babbled out apologies, face on fire, and pulled away. She was sure if she became any more mortified, she would actually combust.
Chelia assured her that it was ok and it just startled her. For some odd reason, the taller slayer also was blushing. The two didn't stick around the clearing for long after that.
The second time, it was Chelia that initiated it and they were a little older than the first time. It'd been a very long day and they ended up in Wendy's apartment, sprawled out on her couch. It felt very natural to just fall into Wendy's arms.
Wendy's arms felt very safe. And warm. Chelia's eyes shot open at that thought and blushed heavily. Thankfully, Wendy's eyes were closed. It didn't take very long for Wendy to succumbed to sleep.
It took Chelia a little longer, but it was warm and safe. Sleep beckoned and she heeded the call. She lay her head on Wendy's chest and Wendy's arms wrapped around her waist even in sleep.
Later when they both woke up, Chelia would admit that it was the best sleep she had in a while and Wendy would smile happily. Wendy would say she didn't mind and that Chelia was very comfortable.
The third time was right after Wendy confessed. Chelia was so happy that her feelings were reciprocated that she tackled the now taller girl to the ground. Her momentum carried the two into the bushes.
Chelia couldn't care less and laughed happily at the girl in her arms. Wendy let out a peal of laughter and hugged the God Slayer closer, glad that all her worrying had been for naught.
After that, countless snuggles were given.