The pair struck up a bond at the beginning of the year, and will share more screen time this week as Lynsey comforts Mercedes following the news that serial killer Silas Blissett will not stand trial.
Hassan told OK Extra of the storyline: "It's been great because Jennifer Metcalfe and I have a good chemistry and we really enjoy filming scenes together. The storyline with the doctor taking advantage of us both was particularly fun.
"I don't think there are enough female friendships on soaps, so it's nice they have that relationship."
Lynsey is currently dating Mercedes's ex-fiancé Riley Costello (Rob Norbury) in secret. The pair leave Mercedes stunned by going public with the romance in next week's episodes.
Hassan explained: "I think [Lynsey's] wracked with guilt… but then she does feel that she deserves to be happy for a change because she usually puts everyone else's needs above her own."
Asked where she wants Lynsey to go next, the actress replied: "It's really hard to think of something that hasn't been done before, but I'm really enjoying the love triangle storyline at the moment because it's so different to the Silas storyline. I just want to do anything that's going to get the tears flowing or your heart jumping. I love all of the high drama!"
Hollyoaks airs weekdays at 6.30pm on Channel 4, with a first look screening at 7pm on E4.