All thanks to the Pandemic

I'm Horace 33 single and doing quite well in my business and have my own house. I live in the city away from most of the family. The only exception is my sister Casey 26 single and pregnant. Casey hadn't gone to university like me and worked a lot of different jobs since leaving school. She moved to the city 4 years ago after splitting with then boyfriend and last year due the pandemic lost her job and needed a place to live. That's when she moved in with me, I named Horace as its an old family name and I was stuck with it, but I can't blame my name for my lack of success with women. I'm just awkward around them and it doesn't bother me. I put most of my efforts into my on line business and have been doing extra well since the start of the pandemic. I work from my 3 bedroom 1 bath home and so the lockdowns weren't a problem to me. Casey like to party and the lockdowns were like torture to her. She couldn't do anything and started to look online to shop, but with no money she couldn't buy anything. Not a problem at first, but then one day she found something she really liked and really wanted it. She asked me would buy for her and I agreed. Her birthday was coming up and it would be her present. Soon other things caught her eye and with Christmas and her next birthday taken care of. We were square as they say, but looking online you get shown more products like you look at online and it became harder for her not to want more things. But she tried to resist and then something really special came up. Casey would have sold her soul for it, but at first she tried to resist it. While having a couple of beers on my birthday she finally asked me about getting for her, I wasn't all that willing and she started to offered things. But nothing I needed at first, but with a lingerie ad on the T V she may have noticed me looking at the model really closely. So made me an offer of showing me herself dressed in her sexist lingerie. This caught attention and we made an agreement she would parade about for me in her sexist lingerie for 2 weeks and I would buy what she wanted. So the next time she wanted something else came to attention she offered to parade again, but I wasn't as keen that time as I had already seen her in everything sexy she had. She had noticed that had gotten a hard-on once or twice while she was parading about and offered to masturbate while dressed in her lingerie, I accepted. While playing with my cock she got excited also and that led to us fucking and then sleeping together every night and she not as careful as we should have been, she got pregnant. As far as the rest of the family knows her boyfriend cleared out on finding out she was pregnant and she living me till after the baby comes and the pandemic exists.