We used to know somebody who I don't think was a deliberate schemer, but who just didn't 'get' boundaries. She would have gladly reciprocated, had she been in a position to do so, except that she made a lot of ongoing life choices which meant that she didn't actually have anything to offer in that respect that anybody else would want to share!
We had two friends in our extended friendship group who were getting married. We'd been at university together, but had since moved far and wide across the country.
All of the rest of us had planned and booked accommodation in the area where the wedding was being held long in advance - and had shared details of our research and where we were staying with this friend, so she could book a room for herself if she wanted to. However, she scoffed at what a waste of money and a needlessly 'soft' option this was and booked herself and her DC a pitch in a nearby farm campsite for a number of nights, to make the most of it - which was almost deserted as the summer had long passed.
As you could probably have anticipated, the driving rain and wind on a remote exposed hillside in Scotland in autumn did not make for a luxury camping experience, and she had (very understandably) had more than enough after the first night.
No bother, you live and learn; time to look for a B&B or similar with a vacancy as close as possible. Except no! The day of the wedding arrived and she realised that the cosy little lodge that the happy couple had booked for themselves for their honeymoon, staying in the same beautiful area for two weeks afterwards, had a small lounge alongside the bedroom that could also - at a push - be slept in with a camping mat and sleeping bag!
Yes, she actually asked if she and her young DC could take over half of a newlywed couple's honeymoon suite on their wedding night (and, I'm guessing, for most of their remaining time there afterwards too)!! In fact, knowing her, I wouldn't have put it past her to complain about her bad back and maybe suggest that she and her DC have the bed and the newlyweds sleep on a camp bed in the lounge instead!
She was most upset, with her (as usual) sob story at the ready, when they politely declined her request and suggested that she make alternative arrangements!