As previously reported, Summer will embark on a relationship with new Erinsborough News recruit Bradley Fox in the build-up to her upcoming departure from Ramsay Street.
The pair work well together as colleagues, but friendship turns to passion when Summer kisses Bradley as they attend a trivia night at Charlie's Bar.
Lucas told TV Week: "Summer's had a few drinks, so she does have a bit of Dutch courage when she plants a kiss on him. She immediately regrets it and starts apologising, only for Bradley to suddenly kiss her back.
"Summer's been with Andrew before, but this is a grown man. It does get pretty steamy between them pretty quickly. He says all the right things and makes Summer feel like such a woman."
Aaron Jeffery, who plays Bradley, added that his character sees no problem with having a much younger love interest.
He said: "Bradley doesn't see anything wrong with having a romantic relationship with Summer. He feels that they are both consenting adults and they're attracted to each other. The way he sees it, this is fun and harmless - no-one is getting hurt."
Neighbours airs these scenes next week on Eleven in Australia and in November on Channel 5 in the UK.